This is a Chinese calque; Mars in Chinese is literally ‘fire star’, 火星
The Hoả part is obviously borrowed.
More on this here.
When I was in the army (I’m from Israel) I once tricked my particularly stupid colleague into thinking I was from Mars. Yes, really.
EDIT: More on this here.
Do the Martians speak Vietnamese?
No, but the bushes do
You were IDF? Awesome.